We have implemented the Landsman converter for an AC/DC grid using a hybrid energy source, and present our hardware implementation in this paper The Landsman converter is a proposed solution to reduce the number of reverse conversions required in individual AC or DC grids, and to simplify the connection of various renewable AC and DC sources and loads to the power system. The input sources for the system are solar panels and wind energy conversion systems (WECS), each equipped with a Landsman converter. The WECS and solar panels are connected to the input DC line. To store energy, a bidirectional DC/DC converter and battery are connected to the DC bus. The dsPIC microcontroller is its ability to generate Pulse Width Modulation (PWM) signals, which are used to provide the gate pulse to the Landsman converter and single-phase voltage source inverter. The single-phase voltage source inverter converts the DC supply to AC and supplies it to the load. grid synchronization, with variable DC and AC loads connected to their respective DC and AC buses to simulate different loads The measurement of various ouput of this hardware is taken in digital oscilloscope. The hardware's output measurements are taken using a digital oscilloscope. the input voltage of 12v is given to the landsman converter from the energy source is shown in figure 11 using DSOWe have implemented the Landsman converter for an AC/DC grid using a hybrid energy source, and present our hardware implementation in this paper The Landsman converter is a proposed solution to reduce the number of reverse conversions required in individual AC or DC grids, and to simplify the connection of various renewable AC and DC sources and loads to the power system. The input sources for the system are solar panels and wind energy conversion systems (WECS), each equipped with a Landsman converter. The WECS and solar panels are connected to the input DC line. To store energy, a bidirectional DC/DC converter and battery are connected to the DC bus. The dsPIC microcontroller is its ability to generate Pulse Width Modulation (PWM) signals, which are used to provide the gate pulse to the Landsman converter and single-phase voltage source inverter. The single-phase voltage source inverter converts the DC supply to AC and supplies it to the load. grid synchronization, with variable DC and AC loads connected to their respective DC and AC buses to simulate different loads The measurement of various ouput of this hardware is taken in digital oscilloscope. The hardware's output measurements are taken using a digital oscilloscope. the input voltage of 12v is given to the landsman converter from the energy source is shown in figure 11 using DSOWe have implemented the Landsman converter for an AC/DC grid using a hybrid energy source, and present our hardware implementation in this paper The Landsman converter is a proposed solution to reduce the number of reverse conversions required in individual AC or dc grid

1. HYBRID ENERGY SOURCE BASED LANDSMAN
CONVERTER FOR AC/DC MICRO GRID
Presented By
GUNAL N (39140015)
LOGESHWARAN J (39140026)
Guided By
Dr .M .Kavitha
Assistant Professor
Department of EEE

3. OBJECTIVES:
To provide fast and efficient reactive power support to maintain
power system voltage stability in the micro grid with LANDSMAN
converter
To improve power quality at the customer side
To maintain voltage stability at grid.

4. INTRODUCTION
A hybrid ac/dc microgrid is proposed to reduce processes of
multiple reverse conversions in an individual ac or dc grid and to
facilitate the connection of various renewable ac and dc sources and
loads to power system.
Renewable power conversion systems are connected in low voltage
ac distribution systems, as distributed generators or ac micro grids
due to environmental issues
Load regulation and Voltage stability is a critical consideration in
improving the security and reliability of power systems.

5. LITERATURE SURVEY:
S.NO Title Author Name Year of
publications
Journal
Name
Remarks
1. Power
management
Strategies for a
Microgrid with
Multiple
Distributed
Generation units
Katiraei, Farid,
and Mohammad
Reza Iravani
2006 IEEE
transactions
on power
systems
 Solar and wind
power systems
are designed
using solar panels
and small wind
turbine
generators for
generating
electricity
 Simple and user
friendly design
 High man power
is required

6. S.NO Title Author
Name
Year of
publications
Journal
Name
Remarks
2. . Autonomous
control of
microgrids
P Paolo, and
Robert
H.Lasseter
2006 IEEE Power
Engineering
Society
General
Meeting
 The Solar panel and
wind energy
conversion systems
are the input
sources and is
connected to PWM
converter which
gives the gate pulse
 Having higher
efficiency and
noiseless operation
 System are too
complex to model
accurately

7. S.NO Title Author Name Year of
publications
Journal
Name
Remarks
3. Design and
control of
microgrid fed
by renewable
energy
generating
sources
Tiwari,
Shailendra
Kumar, Bhim
Singh, and
Puneet Kr Goel
2017 IEEE
Transactions
on Industry
Applications
 The modelling of
hybrid microgrid for
power system
configuration is
done in
MATLAB/SIMULINK
 The machine used
for wind energy
conversion is doubly
fed induction
generator (DFIG) and
a battery bank is
connected to a
common dc bus of
them

8. S.NO Title Author
Name
Year of
publications
Journal
Name
Remarks
4. .Microgrid
protection
Nikkhajoei
Hassan, and
Robert H.
Lasseter
2007 IEEE Power
Engineering
Society
General
Meeting
Models of the power
electronics interface
and control strategies
for fast control of
frequency and
voltage magnitude
without
communication are
drived
It can be used in Wide
applications
Much complicated
system when
Compared to others

9. S.NO Title Author
Name
Year of
publications
Journal
Name
Remarks
5. Micro-grid
simulation
during grid-
connected
and islanded
modes of
operation
Kanellos, F. D
, Al I.
Tsouchnikas,
and N. D.
Hatziargyriou
2005 In Internati
onal
Conferenc
e on
Power
Systems
Transients
 A hybrid microgrid is
Simulated using MATLAB
/SIMULINK environment.The
Operation is carried out for
Grid connected mode.Along
with hybrid microgrid,the
performance of doubly fed
Induction generator,
photovoltaic system is
analysed
 The result may be low
due to variation in solar
Irradiation,cell tempearature
And

10. EXISTING BLOCK DIAGRAM

11. DRAWBACKS OF EXISTING SYSTEM
 High switching losses.
THD is high.
No of solar panels are high.
Higher order ripple contents in the voltage

12. PROBLEM IDENTIFICATION
A single ac or dc grid in the current system has many dc-ac-dc or ac-
dc-ac conversions. It is therefore suggested to use a hybrid ac/dc
microgrid to streamline the procedures of numerous reverse
conversions in a single ac or dc grid and to make it easier to connect
different renewable ac and dc sources and loads to a power system.

13. CIRCUIT DIAGRAM

14. METHODOLOGY
• The solar panel and wind energy conversion systems (WECS) are the input
sources.
• The wind energy conversion systems (WECS) and solar panel having
Landsman converter are connected to the input DC line.
• The PWM generator is used to giving the gate pulse to the landsman
converter and three-phase voltage source inverter.
• The three-phase voltage source inverter is used to convert the DC-AC
supply to the load. The grid synchronization is achieved using hysteresis
current controller
• As energy storage, a battery with a bidirectional DC/DC converter is linked
to the DC bus.
• A variable DC and AC load are connected to their DC and AC buses to
simulate various loads

15. ADVANTAGES OF PROPOSED SYSTEM
Reduced total harmonics distortion.
Increased voltage stability.
Quick response irrespective of the load.
Voltage collapse prevention.

16. LANDSMAN CONVERTER

17. Landsman converter
•The Landsman converter is designed to operate in
continuous conduction mode (CCM) irrespective of the
variation in irradiance level.
•The circuit operation is divided into two modes
Modes of operation:
Mode I – when switch is OFF
• When the switch is off, VC1,the voltage across
intermediate capacitor C1 reverse biases the diode.

18. •The inductor current IL flows through the switch.
•Since VC1is larger than the output voltage V out, C1
discharges through the switch , transferring energy to the
inductor L2 and the output.
• Therefore, Vc1 decreases and IL increases. The input feeds
energy to the input inductor L2.
Mode II – when switch is ON
• When the switch is on, diode is forward biased.
• The inductor current IL flows through the diode.
• The inductor L transfers its stored energy to output through the
diode

19. • On the other hand, C0 is charged through the diode by energy
from both the input and L1.Therefore, Vc1increases and IL
decreases.

20. SPECIFICATION FOR EXISTING AND PROPOSED
CONVERTERS
INPUT VOLTAGE 12V
SWITCHING FREQUENCY 25 kHZ
DUTY RATIO 0.6
LOAD RESISTANCE 100 ohms

21. EXISTING CONVERTER(SEPIC CONVERTER)
SIMULATION

22. GATE PULSE TO THE SWITCH OF THE CONVERTER

23. VOLTAGE RIPPLE

24. INPUT & OUTPUT VOLTAGE OF SEPIC CONVERTER

25. PROPOSED LANDSMAN CONVERTER SIMULATION

26. GATE PULSE TO THE SWITCH OF THE CONVERTER

27. VOLTAGE RIPPLE

28. INPUT & OUTPUT VOLTAGE OF LANDSMAN
CONVERTER

29. COMPARISON OF LANDSMAN AND SEPIC CONVERTER
LANDSMAN CONVERTER SEPIC CONVERTER
OUTPUT VOLTAGE V0 = (1+D)/(1-D).Vin = 38V
( Vin = 12V, D = 0.6 )
V0=D/(1-D).Vin = 34V
( Vin = 12V, D = 0.6 )
LOAD CURRENT 0.38 A 0.35 A
VOLTAGE RIPPLE 0.01 V 1.00V
VOLTAGE GAIN
(V0/Vin)
3.1 2.8

30. VARIABLE INPUTVOLTAGE WITHOUT
CONTROLLER

31. AT t=0.4 to 0.7 ,the input voltage varies from 12V T0 14V.the
output voltage rises from 16V to 20V .

32. VARIABLE INPUTVOLTAGE WITH PI CONTROLLER

33. AT t=0.4 to 0.7 ,the input voltage varies from 12V T0 14V,but
the output remains constant

34. REFERENCES
1. Lasseter, Robert H. "Microgrids." In 2002 IEEE power engineering society winter meeting.
Conference proceedings (Cat. No. 02CH37309), vol. 1, pp. 305-308. IEEE, 2002.
2. Zoka, Y., Sasaki, H., Yorino, N., Kawahara, K. A. K. K., & Liu, C. C. (2004, April). An interaction
problem of distributed generators installed in a MicroGrid. In 2004 IEEE International
Conference on Electric Utility Deregulation, Restructuring and Power Technologies.
Proceedings (Vol. 2, pp. 795-799). IEEE..
3. Lasseter, Robert H., and Paolo Paigi. "Microgrid: A conceptual solution." In 2004 IEEE 35th
annual power electronics specialists conference (IEEE Cat. No. 04CH37551), vol. 6, pp. 4285-
4290. IEEE, 2004.
4. Sao, Charles K., and Peter W. Lehn. "Control and power management of converter fed
microgrids." IEEE Transactions on Power Systems 23, no. 3 (2008): 1088-1098.
5. Logenthiran, Thillainathan, Dipti Srinivasan, and David Wong. "Multi-agent coordination for
DER in MicroGrid." In 2008 IEEE International Conference on Sustainable Energy Technologies,
pp. 77-82. IEEE, 2008..

35. THANK
YOU